Substracting two TIME(6) datatype values - forum topic by larun1616

HI
    I have two columns Start_Time and End_Date in a table with data type TIME(6) and i want to substract the two values in a stored Procedure.
 
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SELECT Log_Time INTO vStart FROM DB.LOG_TABLE

SELECT Log_Time INTO vEnd FROM DB.LOG_TABLE

SET vTotal = CAST( CAST(vEnd AS CHAR(6) ) AS INTERVAL HOUR TO SECOND(6) ) -CAST( CAST(vStart AS CHAR(6) ) AS INTERVAL HOUR TO SECOND(6) ) ;
 
When i try to perform the substraction i get the error '
Invalid or missing expression 'E(5407):Invalid operation for DateTime or Interval.'. Please help me.
 
-Arun